Author: Conor Cunningham

New blog location

Here is the new blog  – please update those readers. http://blogs.msdn.com/conor_cunningham_msft/default.aspx I’m getting settled into working for Microsoft again – it’s basically like drinking from

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The Trouble with Triggers

(Apologies to Star Trek). I received a question about trigger performance, especially the do’s and dont’s about how they are used. Let’s first start by

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COUNT(1) vs. COUNT(star)

A follow-up from my previous post. Is COUNT(1) faster than COUNT(*)? No, COUNT(1) is mapped into COUNT(*) early in the QP.  From the logic of

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